Mus.), Otho C. Io; "Baga de secretis" in Rep. iii., App. ii.
Two pairs of invaginations of B the skin, which originally are called the prostomial and metastomial disks, grow round the intestine, finally fuse together, and form the skin and mus- cular body-wall of the future Nemertine, which afterwards becomes ciliated, frees itself from the pilidium investment and develops into the adult worm without further metamorphosis.
Mus.), E., 138 (14), 122 (12), 118 (40), 119 (18).
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